Possible Causes
| Possible Causes |
|---|
| O2 SENSOR RETURN CIRCUIT SHORTED TO GROUND |
| O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO GROUND |
| O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO THE O2 SENSOR RETURN CIRCUIT |
| O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO THE O2 SENSOR 1/2 HEATER CONTROL CIRCUIT |
| O2 SENSOR 1/2 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .